Vacuum tube generator system



y H. CHIREIX 2,006,440

VACUUM TUBE GENERATOR SYSTEM Original Filed April 5, 1926 INVENTOR HENRICHIRHX ATTORNEY Patented July 2 1935 I I UNITED STATES. PATENT OFFICE yi 2,066,440. f t f VACUUM TUBE .GEN'EaAron SYSTEM Henri Chireix, Paris,France, assignor to. Compagnie Generale de Telegraphic sans FiLParis,France, a corporation of Germany 7 Original application April 5, 1926,Serial No. 99,740, Patent No. 1,755,386yAp1'i1; 22, 19305 Divided andthis application January 25, '1930, Serial No. 423,308." In FranceAugust 10, 1925 15 Claims; (01.250917) 1 f The present invention relatesto improvements in the production of high frequency currents by means ofspace discharge devices and is a division of my United States PatentNumber 1,755,386,

patented April 22, 1930. I

My invention applies to systems of communi cation utilizing purecontinuous Waves or modulated continuous waves.

One of the objects of my invention is toim -f prove the overallefficiency of a communication system by increasing the efiiciency of thetrans-' mitter itself and the constancy of the wavetrans mitted.

The novel features which I believeto bechar' acteristic of my inventionare set forth withparticularity'in the appended claims. My inventionitself, however, both as to its *organizationand method of operationwill best be understoodby reference to the following description takenin connection with the accompanying drawingfiin which, Ihave showndiagrammatically oneway whereby my invention may be carried into effect;In said drawing modulation is affected by the constant current system orthe plate control system. v I v v s 1 Referring to the drawing, 3denotes a space discharge device having its input and output cir-' cuitscoupled in well known manner for the production of oscillations. Thecondenser 15 and inductance l4 denote'the elements adapted and necessaryfor the generation in device 3 of continuous waves and current sources Iand 2 denote respectively theplate andfilament current sources of device3. a f

A'second space-discharge device 5 is also con nected so as to draw itsplate and filamentfc'urrent from sources I and 2 respectively, said delice 5 having its anode connected to the anode w of device 3 through achoke coil 4. 3 s ,"Tube 5 through the medium of switch 12 is adapted toeither act as a modulator tubeampli' fying signals from a microphonecircuit, or as' generator of oscillations. To this end device 5 whenswitch I2 is in the position I4 has its input and output circuitscoupled through the transformer 6 whereby oscillations will be producedat a frequency dependentupon the value of shunted condenser 1. In thefigure condenser 8 is intended to provide a negative bias for the gridof device 5. When switch [2 is in the position l3 device 5 acts as amodulator and amplifier tube the. input. circuit of which comprises amicro phone circuit including microphone l0, battery H, and the primarywinding of an 'audiot'ranscircuit'of-device 5.

. of'telegraphic signals withmodulated continuput of said modulatorcircuit and said microformer 9 the secondary of which is in the inputEnergy may betransmitted through an. an-" tenna system of any desiredkindsuch as 24 or utilized in any desired circuit. The utilizing circuitmay be coupled to the output circuit of space discharge-device 3 asshown, or in any well known manner.

e The operation of the system is as follows: When the change-over switchis in the lower position'the arrangement is that of a telephony 7station -modulated by plate control, whereas; when the'switch I2 is intheupper position device 5 becomes a generator of alternating currentWhose frequency-may be controlled by condenser 1." The potential set upacross the terminals of transformer 6 becomes added to that of thesource in the plate circuit of device3. "It is to be clearly understoodthat there are numerous conceivable modifications of the system thefeature resorted tobeing to use a feed back coupling between the gridand the plate circuitsz'of the modulator tube serving normally for"telephony work, with a View to render this valve a 'self generator' ofacoustic frequency currents. The frequency being adjustable by the aidof convenient condensers and inductance coils. 1 The'invention notlimitedto the particular applications illustrated and that in fact it isadapted to numerous modifications thereof which may be evolved by thoseskilled in the artwithout departing from the spirit and scope of thisinvention.

-Iclaim: -f "(L-In a space discharge device transmissionsystemcomprising a modulator circuit and a'microphone circuit, means foreffecting transmission ous waves which" comprises means for alternatively establishing' a connection between the inphone circuit, or'a backfeed connection between the input and output circuits of the modulatorcircuit for producing audio frequency oscillations therein, means forcontrolling the frequency of said oscillations, at radiofrequencygenerator, and means for modulating the radio frequency oscillationsproduced by said last generator with the audio frequency energy of saidmodulator .circu'it. s 1 I p p In a'transmission system, a radiofrequency oscillation generator, a modulator circuit therefor, said;modulator circuit comprising a space dischargedevice having grid andplate circuits,

comprising an electron discharge device having a plurality ofelectrodes, the output circuit of said modulator being coupled to anelectrode of said electron discharge device oscillator, a microphonecircuit, and switchin means adapted in one position to cause saidelectron discharge device modulator to generate oscillations at afrequency lower than the frequency .of oscillations generated by saidhigh frequency discharge,

device oscillator, whereby the generated rela-' tively low frequencyoscillations are applied to an electrode of said high frequency electrondis.- oharge device oscillatorand in another position to place saidmodulator circuit under control of said microphone circuit.

4. In a system of thecharacter described,1an electron discharge .deviceoscillation generator having an anode, a cathode and a controlelectrode, means for regeneratively coupling said electrodes wherebycontinuous high frequency oscillations are generated by said electrondischarge device mcillator, an electron discharge device modulator, saidmodulator device having an anode, a cathode and a control electrode,means for coupling the anodes of said modulator and said oscillatortogether in parallel for unidirectional anodepotential, and, means forregeneratively connecting the electrodes 01 said.

modulator device wherebyusaid modulator oscillates at a frequency lowerthan the frequency of said high frequency oscillatorwhereby the lowfrequency potential oscillations generated. by said modulatorpotentialsare'algebraically added to the anodeelectrode of said electronedischarge device oscillator whereby the high frequency oscillations inthe output circuit, of said high frequency oscillator aremodulatedinaccordance with the oscillations generated byrsaid modulator.I H i 5. In a radio system of communication. the combination with anantenna and a circuit hay. ing means therein for generating andimpressing upon said antenna awaveformcarrier current; of a telephoniccircuit including atelephonic transmitter; a signaling circuit includinga thermionic valve individual to said wave form carrier. current circuitand serving as a generator of audio frequency signaling current; andmeans for disconnecting said 'valve from said signaling circuit andassociating it with, Said telephonic circuit to serve as ,a. modulatorunder the control of the telephonic currents.v

6. In a radio system ofcommunication the combination with an antenna anda circuit having means therein for-generating and impressing upon saidantenna a wave formcarrier current of a transformer secondary winding inthe aforesaid circuit; a telephonic circuit including a, telephonictransmitter; a signaling circuit including apri un ty to the aforesaidtransformer secondary winding and a thermionic valve serving asv agenerator of audio frequency signaling current;

V phonic transmitter; a signaling circuit including means for producingaudio frequency Wave form signaling current; and means for disconnectingsaid audio frequency Wave producing means from said signaling circuitand associating it with said telephonic circuit to serve as a modulatorunder the control of the telephonic currents, whereby said carriercurrent circuit may be alternately associated with said telephoniccircuit and with said signaling circuit.

8. In a radio system of communication, the combination with an antennaand a circuit having apparatus therein for generating and im- Dressingupon said antenna a wave form carrier current; of a telephonic circuitincluding a telephonic transmitter, a signaling circuit including athermionic valve for producing audio frequency wave form signalingcurrent; and means for disconnecting said thermionic valve from saidsignaling circuit and associating it with said telephonic circuit toserve as a modulator under the control of the telephonic currents,whereby said carrier current circuit may be associated at will witheither said telephonic circuit or with said signaling circuit.

9. In a radio system of communication, the combination with anantennaand a circuit having means therein for generating and impressing uponsaid antenna a waveform carrier current; of a telephonic circuitincluding a telephonic transmitter; a signaling circuit including athermionic valve individual to said wave form carrier current circuitand serving as a generator of audio frequency signaling current; andmeans for disconnecting said valve from said signaling circuit andcoupling it with said telephonic circuit, to serve as an amplifier ofthe telephonic currents and to impress such amplified telephoniccurrents as modulations upon said carrier current circuit,

10. In a radio system of communication, the combination, with an antennaand a circuit hav- 1118 means therein for generating and impressing uponsaid antenna a waveform carrier current, of a transformer secondarywinding in said, circuit, a telephonic circuit including a telephonictransmitter and a transformer primary winding, a plurality oftransformer windings, the first of which is a. primary to said secondaryWinding and the s'econ'd of which is a secondary to said primary'winding, a thermionic valve individual to said wave form carrier currentcircuit, and means operable at will to selectively connect the input ofsaid valve with either of said plurality of transformer windings.

11. In a radio system of communication, the combination, with an antennaand a circuit having means therein for generating and impressing uponsaid antenna a wave form carrier current, of a transformer secondarywinding in said circuit, a telephonic circuit including'a telephonictransmitter and a transformer primary winding, a plurality oftransformer windings, the first of which is a primary to said secondarywinding and; the second of which is a secondary to said primary winding,a thcrmionicflvalve individual to said wave form carrier currentcircuit, and

means operable at will to selectively connect the input of said valvewith the first of said plurality of transformer windings and open saidtelephonic circuit or to connect the input of said valve with the secondof said plurality of transformer wind-- ings and close said telephoniccircuit.

12. In a radio system of communication, the combination with autilization circuit and a generator of high frequency currents forimpressing said currents upon said utilization circuit, of a telephoniccircuit including a microphone, a thermionic valve serving asa generatorof oscillations of lower frequency than said first generator connectedin circuit with said first generator, and switching mechanism forconnecting said valve to said telephonic circuit for changing thecharacteristic of said valve from a generator of said relatively lowerfrequency oscillations to a modulator under control of the telephoniccurrents.

13. In a radio system of communication, the combination with autilization circuit and a generator for generating and impressing uponsaid utilization circuit high frequency oscillations, of a telephoniccircuit including a telephonic transmitter, a signalling circuitincluding a thermionic valve individual to said generator and serving asa generator of relatively lower frequency currents, and switchingmechanism for disconnecting said valve from said signalling circuit andassociating it with said telephonic circuit to serve as a modulatorunder the control of the telephonic currents.

14. In a radio system of communication, the combination with autilization circuit and a circuit having means therein for generatingand impressing upon said utilization circuit a Wave form carriercurrent; of a telephonic circuit including a telephonic transmitter; asignaling circuit including a thermionic valve individual to said waveform carrier current circuit and serving as a generator of audiofrequency signaling current; and means for disconnecting said valve fromsaid signaling circuit and associating it with said telephonic circuitto serve as a modulator under the control of the telephonic currents.

15. In a radio system of communication, thecombination with autilization circuit and a circuit having means therein for generatingand impressing upon said utilization circuit a wave form carriercurrent; of a transformer secondary winding in the aforesaid circuit; atelephonic circuit including a telephonic transmitter; a signalingcircuit including a primary to the aforesaid transformer secondarywinding and a thermionic valve serving as a generator of audio frequencysignaling current; and means for disconnecting said valve from saidsignaling circuit and associating it with said telephonic circuit toserve as a modulator under the control of the telephonic currents.

HENRI CHIREIX.

